91022791112 has 36 divisors (see below), whose sum is σ = 187612806465. Its totient is φ = 41369729280.

The previous prime is 91022791099. The next prime is 91022791117. The reversal of 91022791112 is 21119722019.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 75588704356 + 15434086756 = 274934^2 + 124234^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213334.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91022791117) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9381848 + ... + 9391544.

Almost surely, 2^91022791112 is an apocalyptic number.

It is an amenable number.

91022791112 is an abundant number, since it is smaller than the sum of its proper divisors (96590015353).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91022791112 is an frugal number, since it uses more digits than its factorization.

91022791112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422 (or 9710 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 91022791112 in words is "ninety-one billion, twenty-two million, seven hundred ninety-one thousand, one hundred twelve".